Can anyone recommend a server to run FreeBSD with the following features:

1) Supports multiple (say 4 or more) SATA disks (RAID optional) -
capacity is more important than speed so SAS disks are overkill.

2) Decent on-site support for the whole machine, so probably from a
big-brand manufacturer. Separately purchased add-on cards therefore a
no-no, so no Highpoint/Areca or other SATA controllers unless they
come with the machine.

We started looking at Dell's, having had success with 2850s, but with
the new product line I can't find a suitable controller I know is
supported. The 1900 has a SAS 5/iR for which I can find no definitive
information; the 1430 has a SAS 5/i for which again I can find no "it
works" info. (Note: not the PERC 5 range which at £300+ are simply
overkill).

Sun X4500... holds up to 48 SATA-II drives... Dual Dual-Core Opteron
2.6ghz CPUS, quad gigabit ethernet Only problem is they are really
pricey as on can only order them with 48 500GB drives installed afaik.

Personally, I'd take a second look at putting a 3Ware Escalade
controller into a server yourself... can't beat the cost/performance
you'll get there. Our servers here are all dual opteron based boxes in
rackmount configuration with 3Ware Escalade 4 and 8 port S-ATA RAID
cards in them... knock-on-wood, never had a hardware problem yet.